Help/Build diary for/of my first antweight.

All things antweight

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Puddle
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Joined: Mon Mar 13, 2017 9:25 pm

Re: Help/Build diary for/of my first antweight.

Postby Puddle » Mon Mar 20, 2017 11:48 pm

ok cool thanks, I ended up overcompensating and giving them too much space but that means that I might be able to fit the servo kinda inbetween the motors.
Harry

Puddle
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Joined: Mon Mar 13, 2017 9:25 pm

Re: Help/Build diary for/of my first antweight.

Postby Puddle » Tue Mar 21, 2017 2:37 am

Ok, after some cardboard cannibalism and lots of small bits of tape I return with a half finished mockup of my chassis. I also build a 4" cube to make sure everything was going to fit. I couldn't find the dimensions for everything like speed controllers or the reciever but I did for the motors and servo which are the bulkiest bits from what I know. I've put a vertical bit on the servo to make sure it'd fit inside the wedge and then I wouldn't have to for the motors as they're shorter than the servo but further up the wedge than the servo. I had an Idea to have little fins near the front to act as a hinge with a rod or screw or something for the flipper but I don't quite know how I'll attach them to the rest of it yet. so far it all fits though and with a small bit of metal and some acetate at the front it looks like it'd get under things pretty well. the slope at the front of the cardboard is 30 degrees right now for anyone that's curious.

still to do is the top, the back and the flipper but it took me a while because I had to redo it a few times to get everything lining up nicely, and now I know the lengths of these bits when I get a polycarb sheet I can just draw the base and sides out as one piece and bend them into shape. there's some images below of it, please let me know what you think!

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Harry

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peterwaller
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Re: Help/Build diary for/of my first antweight.

Postby peterwaller » Tue Mar 21, 2017 8:34 am

I found this picture on Ebay and from a quick check it looks good.
The only slight thing is the two mounting holes shown as 1mm ID are in fact tapped M1.6 if you want to mount it that way.
Image

Puddle
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Re: Help/Build diary for/of my first antweight.

Postby Puddle » Wed Mar 22, 2017 4:21 am

Thanks Peter, I now have much more space in my bot as before I had just used the full mesurement. the thing with the holes shouldn't be an issue as I'm planning to use those motor mounts from rory's kits with holes in the bottom of the chassis to screw up into but thanks for letting me know!
Harry

Puddle
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Re: Help/Build diary for/of my first antweight.

Postby Puddle » Mon Mar 27, 2017 3:14 am

Alright so I remade my mockup in sketchup because I couldn't bend the cardboard into a nice enough arc to fit correctly but now I'm wondering, How hard is it to get a nice curve out of polycarb? can I just bend it into shape or is it gonna break? should I just go for a straight edge rather than a rounded one?
Harry

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BeligerAnt
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Re: Help/Build diary for/of my first antweight.

Postby BeligerAnt » Wed Mar 29, 2017 7:48 pm

If you fix polycarb at two ends at different angles it will naturally form a curve :) Take a look at Pants or Make-A-Bot to see how it works. It won't break even if you form it into a sharp bend, so a gentle curve is no problem.
Gary, Team BeligerAnt

Puddle
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Re: Help/Build diary for/of my first antweight.

Postby Puddle » Mon Apr 03, 2017 6:57 pm

Yo! I'm back for another update. It's been a while but sadly life got in the way of robots. I've finally figured out the dimensions that I'm happy with for everything except the flipping blade on the rear hinged end but because I've got a little space to spare in the cube and cardboard isn't the best for that kind of shape I'll work out the specifics of it when I get to the polycarb. Below are some different angles of the new mockup and an earlier sketchup version too. Once I get the money together I'll start ordering parts and then I'll build my bot proper. I'm still kind of unsure on how to hinge the flipper though but I think I could probably get away with using a rod of some sort through the front and attaching it that way. the servo linkage is also something I'll finalise when I get to it but with the final shape of it set it should be easier to experiment and I think I have enough space to try a few different orientations with it.


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Harry

Puddle
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Re: Help/Build diary for/of my first antweight.

Postby Puddle » Fri Apr 07, 2017 12:28 am

Ok so I'm back again, this time with a shopping list!

Nanotwo kit:
no real URL for this except the thread where rory announced it or the email address you send your order to
Battery Bag(apparently you need one of these):
https://hobbyking.com/en_us/lithium-pol ... -sack.html
LiPo Charger:
https://hobbyking.com/en_us/turnigy-12v ... arger.html
Power for the charger:
https://www.amazon.co.uk/Kasstino-Adapt ... wer+supply
LiPo:
https://hobbyking.com/en_us/turnigy-nan ... tore=en_us
Flipper Servo:
https://hobbyking.com/en_us/turnigytm-t ... tore=en_us
1.5mm Polycarb:
http://www.ebay.co.uk/itm/LEXAN-POLYCAR ... 53e5d55427
1mm Aluminium
http://www.ebay.co.uk/itm/like/26124836 ... 0213340945
Transmitter:
https://www.amazon.co.uk/gp/product/B00 ... UTF8&psc=1

I've read around and I'm 90% sure that this will all work together. the aluminium is for the tips of each wedge so that I can sharpen it and have a nice low ground clearance. I do still have a couple questions though as I don't wanna spend money on something and then find out that I needed something else and I wasted it or that I missed something crucial. so in no particular order;
1. Do I need some sort of switch or link for safety and does the Nanotwo kit come with anything like that already?
2. if not then would I need a soldering iron to attach one? as I don't currently own one.
3. is the LiPo charging bag something that's definitely required or is it just there for people who worry too much?
4. How would I attach one of those linkage rods to the servo and flipper? would I need a hook-ey type thing on the flipper or something else?

Alright I think that's everything. Please let me know what you think and if there's anything that you'd do differently. if nobody comes in and tells me to stop what I'm doing immediately because I've made a terrible mistake in component choice or it's gonna explode or something then I'll probably order everything and get started building it in a week or so. So stay tuned for more riveting action such as me asking how to do a thing or posting a drawing of how I will accomplish a thing. and I'll hope to see you all at the next event unless that next event is too soon like tomorrow or something :D .
Harry

GeorgeR
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Re: Help/Build diary for/of my first antweight.

Postby GeorgeR » Sun Apr 09, 2017 11:07 am

This list looks pretty good to me, but to answer your questions;
1) You need a way of turning off the power without using tools to disassemble the robot. This can be a link, a switch, or even having the ability to unplug the battery by lifting up the flipper panel. I would recommend a switch as removing the battery every fight is a pita. The nanotwo doesn't come with a switch but a small slide switch should do, I use the ones sold by Shakey on the forum here.
2) Yes you will need a soldering iron for this, a cheap one will do fine, but make sure it has a small tip, because antweight components are small! (if you've not soldered before its worth practicing on some loose wires before doing the ant, but its easy once you get the hang of it)
3) Yes get one. Worst case scenario a lipo fire could burn your house down, a few quid is well worth it for safety.
4) I've not personally built a flipper, but I've seen people use a bit of wire (bent paperclip?) to connect it up.

To get the front of the flipper low to the ground most people use a thin bit of acetate stuck to the flipper that scrapes the floor. Search for acetate sheet or ohp paper on ebay.

Good luck with the build, the design look nice!
Team Zero
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Occashokka
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Re: Help/Build diary for/of my first antweight.

Postby Occashokka » Sun Apr 09, 2017 6:37 pm

Yea I use bent piano wire which is just thick paperclips, the servo horn usually has holes in it you can widen out or poke it through and then you just have to make a loop on the underside of the flipper plate to bend it through
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-not yet built nasty mean spinnt thingy

I'm gonna build something huge and stupid, try and stop me :P


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